NOT: Item

Blow Off Set / Dump Valve for Turbo Diesel
$219 and $40, you need to be on crack to buy it!
Watch your $260 in action Video. Now go for a drive and listen to the roar of people laughing at you!

oh god i hate blow off valves. They sound horrible on those POS dodge neons SRT4's

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That thing looks like it should be on the handlebar of a tricycle the clowns ride.!

ROFLMAO!! Al, you've made my day!

Noob question: what the hell does a BOV do anyway?

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Never a dull moment at Berry Hill Farm.

Sounds like a condensation valve on a air brake system.

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86 Holden Jackaroo Turbo D
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Notice he writes "when you let off your pedal fastly"
Thats why you guys think you dont need it. You dont let your foot off the pedal fastly enough.

A BOV is used only on gas engines as far as i know. The reason for a BOV is when you let of the pedal the throttle plate closes this causes all the air from the turbo to the throtle plate to "back-up". That then shoves the compresser wheel in the turbo and causes the bearings to wear out. it also causes the turbo to slow down which then takes longer to build boost again.

hope this helps

I don't see how a BOV or a BPV (by-pass valve, used on many OEM turbocharged cars) wouldn't work the same on a diesel engine.

Like Mr. Stroker said, it keeps pressurized air from hitting the turbine blades (often spinning at 100,000+ rpm) helping to alleviate surge and damage to the turbo.

Blow off valves do have a use on a diesel but its not for performance reasons. People who put overly aggressive turbos on manual transmission diesel can encounter compressor surge when they shift. When this problem occurs a blow off valve is called for to prevent wear and tear on the turbo.

Think of it as like adding an oil cooler. It doesn't add power but its needed when you hotrod the other parts of the engine.

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green 85 300SD 200K miles "Das Schlepper Frog" With a OM603 TBO360 turbo ( To be intercooled someday )( Kalifornistani emissons )
white 79 300SD 200K'ish miles "Farfegnugen" (RIP - cracked crank)
desert storm primer 63 T-bird "The Undead" (long term hibernation)

http://ecomodder.com/forum/fe-graphs/sig692a.png

Here's a clue: DIESEL ENGINES DON'T HAVE A THROTTLE.

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'83 240D with 617.952 and 2.88
'01 VW Beetle TDI
'05 Jeep Liberty CRD
'89 Toyota 4x4, needs 2L-T
'78 280Z with L28ET - 12.86@110
Oil Burner Kartel #35

http://i16.photobucket.com/albums/b1...oD/bioclip.jpg

doh... owned

Well then, yes... that's a very good reason to NOT buy a BOV for your Mercedes diesel!

The only thing missing, is the red squeeze bulb, available for an additional C-note.

Diesels don't have a throttle but when the engine rpms drop quickly, like durring a shift with a manual transmission, you can still have a compressor surge occur.

I belive Forcedinduction had a video of it happening to his 240D with a 3.0L turbo in it.

__________________
green 85 300SD 200K miles "Das Schlepper Frog" With a OM603 TBO360 turbo ( To be intercooled someday )( Kalifornistani emissons )
white 79 300SD 200K'ish miles "Farfegnugen" (RIP - cracked crank)
desert storm primer 63 T-bird "The Undead" (long term hibernation)

http://ecomodder.com/forum/fe-graphs/sig692a.png

I have a compressor bypass valve on my turbo gasser. The trick to avoiding compressor surge is to not let up on the fuel when shifting.

__________________
'83 240D with 617.952 and 2.88
'01 VW Beetle TDI
'05 Jeep Liberty CRD
'89 Toyota 4x4, needs 2L-T
'78 280Z with L28ET - 12.86@110
Oil Burner Kartel #35

http://i16.photobucket.com/albums/b1...oD/bioclip.jpg

I do: VIDEO. That is NOT a BOV, it's surge. The turbo is the stock Garrett T3. Letting off the throttle (Yes, FUEL throttle) quickly will cause a backup of air causing surge in the T3. That video is one of the main reasons I use the K26 with my manual tranny insted of the T3. I doubt it would last very long after 100+ shifts per day.

Even with my experience with the Garrett, I don't advocate the use of a BOV with diesels. The surge that thing had is 1/16th what a gasser turbo would have.